Epidemiological and Molecular Characteristics of the PB1-F2 Proteins in H7N9 Influenza Viruses, Jiangsu

Table 1

Selection pressure analysis of PB1-F2 protein of H7N9 and H9N2 virus using SLAC, FEL, and REL methods.

Methods	Positive selection site data				Negative selection site data
	Position	Normalised () dN/dS	value	Bayes factor	Position	Normalised () dN/dS	value	Bayes factor
SLAC	48	11.39	0.026	/	24	−7.98	0.039	/
					65	−9.36	0.032	/
FEL	21	53.25	0.028	/	24	−46.26	0.007	/
	37	25.16	0.097	/	65	−57.34	0.052	/
	46	27.01	0.091	/
	48	77.94	0.003	/
	54	33.57	0.042	/
	82	30.98	0.039	/
REL	30	2.43	/	83.30	16	−9.51	/	131.91
	38	2.44	/	113.39	24	−14.28	/	10558.2
	43	3.65	/	118.39	65	−12.57	/	11504.5
	48	18.14	/	357.09
	64	2.38	/	200.36
	72	3.71	/	198.05
	82	4.75	/	187.46

SLAC: single likelihood ancestor counting.
FEL: fixed effects likelihood.
REL: random effects likelihood.